isalnum example in C

Header file:

    ctype.h

Synopsis:

    int isalnum(int c)

Description:

    Checks whether the given input is an alphanumeric character or not.

Return Value:

    TRUE(a non-zero value) on success

    0 on failure

isalnum function C example

  #include<stdio.h>
  #include<ctype.h>
  int main() {
        char c;
        printf("Enter your input:");
        c = getchar();

        if (isalnum(c))
                printf("The given input is alphanumberic\n");
        else
                printf("The given input is not alphanumeric\n");

        printf("The return value from isalnum: %d\n", isalnum(c));
        return 0;
  }

  Output:

  Enter your input:8
  The given input is alphanumberic
  The return value from isalnum: 8